[gtk+/multitouch: 110/129] gdkwindow: Add device parameter to gdk_window_create_touch_cluster()

[Carlos Garnacho <carlosg src gnome org>]

commit c38159d4d78feb0500fc052dab4e21e92203fcbe
Author: Carlos Garnacho <carlosg gnome org>
Date:   Thu Jan 12 02:11:01 2012 +0100

    gdkwindow: Add device parameter to gdk_window_create_touch_cluster()
    
    gdk_touch_cluster_set_device() had to be called right after anyway,
    so set the device directly within this call, and favor the most common
    scenario where there's just 1 single multitouch device behind 1 master
    device.

 demos/gtk-demo/multitouch.c |   15 ++++++++-------
 gdk/gdkwindow.c             |   10 ++++++++--
 gdk/gdkwindow.h             |    3 ++-
 3 files changed, 18 insertions(+), 10 deletions(-)
---
diff --git a/demos/gtk-demo/multitouch.c b/demos/gtk-demo/multitouch.c
index a85161f..0fcec64 100644
--- a/demos/gtk-demo/multitouch.c
+++ b/demos/gtk-demo/multitouch.c
@@ -410,13 +410,14 @@ button_press_cb (GtkWidget *widget,
       shape_update_scales (shape);
 
       if (!shape->cluster)
-        shape->cluster = gdk_window_create_touch_cluster (gtk_widget_get_window (widget));
-
-      /* Only change cluster device if there were no touches or no device */
-      if (!gdk_touch_cluster_get_device (shape->cluster) ||
-          !gdk_touch_cluster_get_touches (shape->cluster))
-        gdk_touch_cluster_set_device (shape->cluster,
-                                      gdk_event_get_device (event));
+        shape->cluster = gdk_window_create_touch_cluster (gtk_widget_get_window (widget),
+                                                          gdk_event_get_device (event));
+      else if (!gdk_touch_cluster_get_touches (shape->cluster))
+        {
+          /* Only change cluster device if there were no touches */
+          gdk_touch_cluster_set_device (shape->cluster,
+                                        gdk_event_get_device (event));
+        }
 
       gdk_touch_cluster_add_touch (shape->cluster, touch_id);
       return TRUE;
diff --git a/gdk/gdkwindow.c b/gdk/gdkwindow.c
index 6c6ce97..5103d44 100644
--- a/gdk/gdkwindow.c
+++ b/gdk/gdkwindow.c
@@ -11617,19 +11617,23 @@ touch_cluster_touch_removed (GdkTouchCluster *cluster,
 /**
  * gdk_window_create_touch_cluster:
  * @window: a #GdkWindow
+ * @device: device to be associated to the cluster
  *
- * Creates a #GdkTouchCluster associated to @window.
+ * Creates a #GdkTouchCluster associated to @window, with @device
+ * as its current device.
  *
  * Returns: (transfer none): a newly created @GdkTouchCluster. This
  *          object is owned by @window and must be freed through
  *          gdk_window_remove_touch_cluster().
  **/
 GdkTouchCluster *
-gdk_window_create_touch_cluster (GdkWindow *window)
+gdk_window_create_touch_cluster (GdkWindow *window,
+                                 GdkDevice *device)
 {
   GdkTouchCluster *cluster;
 
   g_return_val_if_fail (GDK_IS_WINDOW (window), NULL);
+  g_return_val_if_fail (GDK_IS_DEVICE (device), NULL);
 
   cluster = g_object_new (GDK_TYPE_TOUCH_CLUSTER, NULL);
   g_signal_connect (cluster, "touch-added",
@@ -11637,6 +11641,8 @@ gdk_window_create_touch_cluster (GdkWindow *window)
   g_signal_connect (cluster, "touch-removed",
                     G_CALLBACK (touch_cluster_touch_removed), window);
 
+  gdk_touch_cluster_set_device (cluster, device);
+
   window->touch_clusters = g_list_prepend (window->touch_clusters, cluster);
 
   return cluster;
diff --git a/gdk/gdkwindow.h b/gdk/gdkwindow.h
index cd70cf3..86afd91 100644
--- a/gdk/gdkwindow.h
+++ b/gdk/gdkwindow.h
@@ -880,7 +880,8 @@ void       gdk_window_set_support_multidevice (GdkWindow *window,
 gboolean   gdk_window_get_support_multidevice (GdkWindow *window);
 
 /* Multitouch support */
-GdkTouchCluster * gdk_window_create_touch_cluster (GdkWindow       *window);
+GdkTouchCluster * gdk_window_create_touch_cluster (GdkWindow       *window,
+                                                   GdkDevice       *device);
 void              gdk_window_remove_touch_cluster (GdkWindow       *window,
                                                    GdkTouchCluster *cluster);